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            background-color: pink;
            text-align: center;
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        .one {
            background-image: url("https://ts3.cn.mm.bing.net/th?id=OIP-C.piALtaBxg4UhandYtt-vsQHaEr&w=314&h=198&c=8&rs=1&qlt=90&o=6&pid=3.1&rm=2");
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        .two {
            background-image: url("https://ts3.cn.mm.bing.net/th?id=OIP-C.ZkoPhpKfJwsvGmpm8RsragHaFp&w=286&h=218&c=8&rs=1&qlt=90&o=6&pid=3.1&rm=2");
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        .four {
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        .one:hover {
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        }
        .two:hover {
            background-image: url("https://tse4-mm.cn.bing.net/th/id/OIP-C.fRcds9XkcVRwMykirh4mIgHaE8?w=257&h=180&c=7&r=0&o=5&pid=1.7");
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        .three:hover {
            background-image: url("https://tse2-mm.cn.bing.net/th/id/OIP-C.p1soM-C5zVFsl5nZ82j0aAHaE8?w=249&h=180&c=7&r=0&o=5&pid=1.7");
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        .four:hover {
            background-image: url("https://tse1-mm.cn.bing.net/th/id/OIP-C.e97IQxn10prd6gFcaDoQaQHaE7?w=255&h=180&c=7&r=0&o=5&pid=1.7");
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<a href="#" class="one">五彩导航</a>
<a href="#" class="two">五彩导航</a>
<a href="#" class="three">五彩导航</a>
<a href="#" class="four">五彩导航</a>
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